Gabbro

Skarn

Gabbro and Skarn

Gabbro

Skarn

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Definition

Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt

Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin

History

Origin

Germany

USA, Australia

Discoverer

Christian Leopold von Buch

Tornebohm

Etymology

From Latin glaber bare, smooth, bald

From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Phaneritic

Earthy, Mud-rich, Rough

Color

Dark Grey to Black

Black, Brown, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Veined and Shiny

Dull

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Homes, Interior Decoration

Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone

As Building Stone, As Facing Stone, Garden Decoration, Paving Stone

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate

As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Gold and Silver production, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Laboratory bench tops, Jewelry, Sea Defence, Tombstones

Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)

Types

Anorthosite Gabbro and Norite Gabbro

Endoskarns

Features

Smooth to touch

Host Rock for Lead, Zinc and Copper Deposits

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Gabbro, a mafic rock, forms due to cooling and crystallization of magma underneath Earth's surface.

Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Skarn is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

Augite, Olivine, Plagioclase, Pyroxene

Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite

Compound Content

Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide

Au, CaO, Carbon Dioxide, Cu, Fe, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Impact Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Chemical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion

Properties

Physical Properties

Hardness

76.5

1 7

👆🏻

Grain Size

Coarse Grained

Fine Grained

Fracture

Conchoidal

Irregular

Streak

Black

Light to dark brown

Porosity

Highly Porous

Less Porous

Luster

Waxy and Dull

Compressive Strength

225.00 N/mm²70.00 N/mm²

0.15 450

👆🏻

Cleavage

Slaty

Toughness

1.6

2.4

Specific Gravity

2.86-2.872.86

0 8.4

👆🏻

Transparency

Opaque

Density

2.7-3.3 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.71 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Impact Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

China, India, Russia, Saudi Arabia, South Korea, Sri Lanka

Africa

South Africa

South Africa, Western Africa

Europe

Germany, Greece, Italy, Scotland, Turkey

United Kingdom

Others

Greenland

Deposits in Western Continents

North America

Canada, USA

Canada

South America

Brazil, Colombia, Venezuela

Brazil, Colombia, Paraguay

Deposits in Oceania Continent

Australia

New Zealand, Queensland

Central Australia, Western Australia

All about Gabbro and Skarn Properties

Know all about Gabbro and Skarn properties here. All properties of rocks are important as they define the type of rock and its application. Gabbro belongs to Igneous Rocks while Skarn belongs to Metamorphic Rocks.Texture of Gabbro is Phaneritic whereas that of Skarn is Earthy, Mud-rich, Rough. Gabbro appears Veined and Shiny and Skarn appears Dull. The luster of Gabbro is while that of Skarn is waxy and dull. Gabbro is available in dark grey to black colors whereas Skarn is available in black, brown, green, grey, white colors. The commercial uses of Gabbro are cemetery markers, commemorative tablets, laboratory bench tops, jewelry, sea defence, tombstones and that of Skarn are creating artwork, gemstone, jewelry, metallurgical flux, source of magnesia (mgo).